Looks up localised messages from resource bundles, with a default bundle and locale.

Provides utility goals to work with dependencies like copying, unpacking, analyzing, resolving and many more.

Generates a report on violations of code style and optionally fails the build if violations are detected.

The Maven Site Plugin is a plugin that generates a site for the current project.

The Versions Maven Plugin is used when you want to manage the versions of artifacts in a project's POM.

A Maven plugin for the PMD toolkit, that produces a report on both code rule violations and detected copy and paste fragments, as well as being able to fail the build based on these metrics.

The Maven Project Info Reports Plugin generates standard reports for the specified project.

The Maven Invoker Plugin is used to run a set of Maven projects. The plugin can determine whether each project execution is successful, and optionally can verify the output generated from a given project execution.

Clirr is a tool that checks Java libraries for binary and source compatibility with older releases. Basically you give it two sets of jar files and Clirr dumps out a list of changes in the public API.

Maven Surefire Report MOJO in maven-surefire-report-plugin.

Vaadin Maven Plugin